EP0313758B1 - Procédé et dispositif de refroidissement de cendres volantes - Google Patents

Procédé et dispositif de refroidissement de cendres volantes Download PDF

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Publication number
EP0313758B1
EP0313758B1 EP88113849A EP88113849A EP0313758B1 EP 0313758 B1 EP0313758 B1 EP 0313758B1 EP 88113849 A EP88113849 A EP 88113849A EP 88113849 A EP88113849 A EP 88113849A EP 0313758 B1 EP0313758 B1 EP 0313758B1
Authority
EP
European Patent Office
Prior art keywords
lock system
pressure
flue gas
dust
cooled
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP88113849A
Other languages
German (de)
English (en)
Other versions
EP0313758A1 (fr
Inventor
Frank Dziobek
Horst Dr. Möllenhoff
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Deutsche Babcock Werke Energie und Umwelttechnik AG
Original Assignee
Deutsche Babcock Werke Energie und Umwelttechnik AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Deutsche Babcock Werke Energie und Umwelttechnik AG filed Critical Deutsche Babcock Werke Energie und Umwelttechnik AG
Priority to AT88113849T priority Critical patent/ATE68579T1/de
Publication of EP0313758A1 publication Critical patent/EP0313758A1/fr
Application granted granted Critical
Publication of EP0313758B1 publication Critical patent/EP0313758B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J3/00—Removing solid residues from passages or chambers beyond the fire, e.g. from flues by soot blowers
    • F23J3/06—Systems for accumulating residues from different parts of furnace plant
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C10/00—Fluidised bed combustion apparatus
    • F23C10/16—Fluidised bed combustion apparatus specially adapted for operation at superatmospheric pressures, e.g. by the arrangement of the combustion chamber and its auxiliary systems inside a pressure vessel

Definitions

  • the invention relates to a method and a device for cooling flying dust with the features of the preamble of claims 1 and 4.
  • the invention has for its object to design the known airborne dust transport cooler so that erosion damage from dust, corrosion damage from the transport gas and clogging of the transport line by falling below the dew point are avoided.
  • the cooling takes place in two stages, the pressure lock system serving to reduce the pressure being provided between the cooling stages. Pressure reducing and thus erosion sensitive installations in the pipe system of the cooler are not necessary.
  • the hot area there is also no need for erosion-sensitive injectors, since flue gas is used as the transport gas in the first cooling stage.
  • the final temperature of the flying dust at the end of the first cooling stage is limited to a temperature above the dew point of the flue gas.
  • Air is used as the transport gas during the cooling to the final temperature in the second cooling stage, which allows proper disposal, since air cannot drop below the dew point. Since the airborne dust temperature has dropped considerably before entering the second cooling stage, the erosion problem must be controlled within the injector required to supply the conveying air.
  • the drawing shows a flow diagram for cooling and transporting the dust.
  • the combustion chamber 1 of a fluidized bed furnace operated under pressure is connected on the flue gas side to a separator 2, for example a cyclone, in which flyaway dust is separated from the flue gas.
  • the separator 2 which is followed by further separators, has a gas discharge 3 and one Solid discharge 4, to which a cooler 5 is connected.
  • the cooler 5 is a tube cooler designed as a double tube, which consists of an inner tube 6, which serves to hold the dust, which is surrounded by a cooling jacket 7.
  • a cooling jacket 7 is provided with a feed pipe 8 and a discharge pipe 9 for the coolant. Pressurized water or an organic coolant with a higher boiling temperature is used as the coolant.
  • the inlet temperature of the coolant is 140 degrees C.
  • the inner tube 6 of the cooler 5 is connected to a separator 10 in which the dust and flue gas are separated.
  • the separator 10 is provided with a gas discharge 11 and a solid discharge 12.
  • a flow regulator 14 acting on a valve 13 is arranged in the gas discharge 11 for maintaining pressure.
  • the solids discharge 12 of the separator 10 is connected to a pressure lock system, which consists of a storage tank 15 and a lock tank 16.
  • the separator 10 can also be integrated into the storage container 15.
  • the reservoir 15 and the lock container 16 are connected by a solid line 18 to a shut-off valve 17 and by a pressure compensation line 19.
  • a level meter 20 is connected to the reservoir 15.
  • a differential pressure meter 21 is located in a measuring line between the supply container 15 and the lock container 16.
  • the lock container 16 is provided with a pressure line 22 for supplying compressed air for covering and with a vent line 23 for relaxation.
  • a shut-off valve 24 is arranged in each of the pressure line 22 and the vent line 23.
  • the pressure lock system is actuated in such a way that the emptying of the storage container 15 into the lock container 16 is started via the fill level meter 20 when no pressure difference is displayed on the differential pressure meter 21 after covering the lock container 16.
  • the solids discharge from the lock container 16 is connected via a lockable solids line 25 to an injector 26 which is provided with a connection 27 for conveying air.
  • the injector 26 is connected to a second cooler 28.
  • the cooler 28 is a tube cooler designed as a double tube, which consists of an inner tube 29, which conveys the dust, and a cooling jacket 30 surrounding the tube 29. Instead of a tube, a bundle of tubes connected in parallel, which are enclosed by a common cooling jacket, can also be used.
  • the cooling jacket 30 is provided with a feed connector 31 and an outlet connector 32 for the coolant. Low-pressure water with a temperature of around 30 degrees C is used as the coolant.
  • the inner tube 29 of the second cooler 28 opens into a silo 33 which is under atmospheric pressure.
  • the silo 33 is provided with a solids discharge 34 and with an exhaust air line 35 in which an exhaust air filter 36 is arranged.
  • the vent line 23 is also connected to the silo 33.
  • the flue gas containing the fly dust leaves the combustion chamber 1 at full load at a temperature of approximately 850 degrees C. and a pressure of approximately 16 bar.
  • the separator 2 for separating flue dust and flue gas is operated in such a way that the flue dust is conveyed through the cooler 5 serving as a transport route with the aid of the flue gas.
  • the amount of flue gas drawn off with the flying dust is regulated in such a way that a transport speed is set at the inlet of the cooler 5, which is also at the outlet the cooler 5 allows pneumatic transport.
  • the coolant enters the cooler 5 at a temperature of approximately 140 degrees C and exits at a temperature of approximately 160 degrees C.
  • the heat transfer in the inner tube 6 is sufficient to cool the flying dust-flue gas mixture down to a temperature between 160 degrees C and 200 degrees C with the appropriate tube length and diameter. This temperature is above the water and acid dew point of the flue gas used.
  • the pressure loss when flowing through the inner tube 6 of the cooler 5 is low and, depending on the amount of fly dust and line length, is between 0 and 3 bar.
  • the airborne dust is reduced in the pressure lock system consisting of storage container 15 and lock container 16 to a pressure which is required to convey air into the silo 33 with the aid of air.
  • the pressure of the conveying air entering the injector 26 is equal to or greater than this pressure. Relaxing to a pressure above atmospheric pressure reduces the amount of time and energy required.
  • the pressure of the fly dust is reduced to atmospheric pressure and the temperature of the fly dust is reduced to approximately 50 to 80 degrees C. At this temperature, the dust can be disposed of.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Chimneys And Flues (AREA)
  • Sorption Type Refrigeration Machines (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)
  • Treating Waste Gases (AREA)
  • Gasification And Melting Of Waste (AREA)
  • Fluidized-Bed Combustion And Resonant Combustion (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Processing Of Solid Wastes (AREA)
  • Cyclones (AREA)

Claims (4)

1. Procédé de refroidissement de cendres volantes, séparées des gaz de fumée sous pression d'un foyer à lit fluidisé, et véhiculé pneumatiquement, grâce à un ou plusieurs tubes refroidis extérieurement, vers un système de sas pressurisé, et où les cendres volantes sont véhiculées par de l'air, après sortie du système de sas pressurisé, caractérisé en ce que les cendres volantes sont véhiculées dans le ou les tubes refroidis, à l'aide d'un débit partiel, extrait conjointement avec les cendres volantes, du gaz de fumée, où les cendres volantes sont refroidies à une température située au-dessus du point de condensation et du point de rosée acide des gaz de fumée, les cendres volantes étant séparées des gaz de fumée avant d'entrer dans le système de sas pressurisé et les cendres volantes étant refroidies à la température finale après sortie du système de sas pressurisé, au moyen d'un deuxième refroidisseur.
2. Procédé selon la revendication 1, caractérisé en ce que les cendres volantes sont détendues dans le système de sas pressurisé à une pression supérieure à la pression atmosphérique.
3. Procédé selon la revendication 1 ou 2, caractérisé en ce qu'on utilise dans le premier étage de refroidissement un fluide de réfrigération dont la température est située au-dessus de la température du point de condensation et du point de rosée acide des gaz de fumée utilisés.
4. Dispositif de refroidissement et de transport de cendres volantes, séparées des gaz de fumée sous pression d'un foyer à lit fluidisé, dans un ou plusieurs séparateurs (2), le ou les séparateurs (2) étant reliés à un système de sas pressurisé, par un ou plusieurs tubes (6) refroidis de l'extérieur, et un injecteur (26) pourvu d'une alimentation en air comprimé (27) étant raccordé à l'évacuation (25) du système de sas pressurisé, caractérisé en ce qu'un séparateur (10) supplémentaire est disposé à l'entrée du système de sas pressurisé, derrière les tubes refroidis de l'extérieur (6), et qu'un deuxième refroidisseur, composé d'un ou plusieurs tubes (29) refroidis de l'extérieur, est raccordé à l'évacuation (25) du système de sas pressurisé.
EP88113849A 1987-10-28 1988-08-25 Procédé et dispositif de refroidissement de cendres volantes Expired - Lifetime EP0313758B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88113849T ATE68579T1 (de) 1987-10-28 1988-08-25 Verfahren und vorrichtung zum kuehlen von flugstaub.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3736521 1987-10-28
DE3736521A DE3736521C1 (de) 1987-10-28 1987-10-28 Verfahren und Vorrichtung zum Kuehlen von Flugstaub

Publications (2)

Publication Number Publication Date
EP0313758A1 EP0313758A1 (fr) 1989-05-03
EP0313758B1 true EP0313758B1 (fr) 1991-10-16

Family

ID=6339275

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88113849A Expired - Lifetime EP0313758B1 (fr) 1987-10-28 1988-08-25 Procédé et dispositif de refroidissement de cendres volantes

Country Status (9)

Country Link
US (1) US4877423A (fr)
EP (1) EP0313758B1 (fr)
JP (1) JP2627938B2 (fr)
AT (1) ATE68579T1 (fr)
CA (1) CA1305310C (fr)
DE (2) DE3736521C1 (fr)
DK (1) DK165020C (fr)
ES (1) ES2026614T3 (fr)
GR (1) GR3003014T3 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI106742B (fi) 1999-06-28 2001-03-30 Foster Wheeler Energia Oy Menetelmä ja laite korkeapaineisen hiukkasmaisen materiaalin käsittelemiseksi
GB0512998D0 (en) * 2005-06-27 2005-08-03 Inbulk Technologies Ltd Pneumatic conveying velocity control device
FR3013232A1 (fr) * 2013-11-21 2015-05-22 Commissariat Energie Atomique Dispositif de transfert de materiau granulaire a consommation d'energie reduite
CN104401735B (zh) * 2014-10-20 2018-08-14 山东鲁南渤瑞危险废物集中处置有限公司 一种全工况下的转炉一次干法除尘蒸发冷却塔粗灰气力输送系统
CN104401734B (zh) * 2014-10-20 2018-09-21 嘉兴智慧园区营运管理有限公司 一种全工况下的转炉一次干法除尘蒸发冷却塔粗灰气力输送系统
CN108534159B (zh) * 2018-04-28 2023-08-08 河南禾力能源有限公司 一种工业锅炉排渣用空压机的自动调压装置

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2076235A (en) * 1933-10-21 1937-04-06 Solvay Process Co Gas purification
US2675889A (en) * 1949-04-01 1954-04-20 Schweizerhall Saeurefab Method for processing crude gases obtained on halogenating metallic ores
US2802280A (en) * 1954-10-13 1957-08-13 Smidth & Co As F L Heat-exchange apparatus including cyclone separators
US2973057A (en) * 1955-11-30 1961-02-28 Bituminous Coal Research Method and apparatus for fly-ash separation in coal-burning gas turbine
US3592630A (en) * 1968-05-03 1971-07-13 Chemical Construction Corp Removal of off-gases from oxygen steel converters
SU445450A1 (ru) * 1970-01-08 1974-10-05 Предприятие П/Я А-3323 Способ транспортировки газа по трубопроводу до газосборного пункта
DE2623290A1 (de) * 1976-05-25 1977-12-08 Wacker Chemitronic Verfahren zur herstellung von trichlorsilan und/oder siliciumtetrachlorid
DE3124483A1 (de) * 1981-06-23 1983-01-13 Didier-Werke Ag, 6200 Wiesbaden Filteranlage
NL8101446A (nl) * 1981-03-24 1981-11-02 Shell Int Research Werkwijze voor het zuiveren van een vliegas bevattend gas.
NL8105903A (nl) * 1981-12-30 1983-07-18 Shell Int Research Werkwijze voor het verwijderen van vaste stofdeeltjes uit een gas.
DE3205720A1 (de) * 1982-02-18 1983-08-25 Deutsche Babcock Werke AG, 4200 Oberhausen Vorrichtung zum austragen und kuehlen von heissem staub
AU558049B2 (en) * 1982-10-08 1987-01-15 Asea Stal Aktiebolag Collection of spent material and fly ash from a pressurised fluidised bed combustor
SE436248B (sv) * 1983-04-15 1984-11-26 Asea Atom Ab Tryckreduceringsventil for utmatning av stoft fran en tryckbehallare exempelvis en cyklon varvid ventilen innehaller fluidiserbara partiklar
DE3324388A1 (de) * 1983-07-06 1985-01-17 Kraftwerk Union AG, 4330 Mülheim Verfahren und anlage zur wiederaufwaermung von rauchgasen hinter einer nassen rauchgasentschwefelungsanlage
JPS61238316A (ja) * 1985-04-16 1986-10-23 Sumitomo Metal Ind Ltd 高温含塵ガス用排熱回収設備の除塵方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
VGB Kraftwerkstechnik 63 (1983), Seiten 422 bis 427 *

Also Published As

Publication number Publication date
JP2627938B2 (ja) 1997-07-09
DE3865626D1 (de) 1991-11-21
US4877423A (en) 1989-10-31
GR3003014T3 (en) 1993-02-17
JPH01142314A (ja) 1989-06-05
DE3736521C1 (de) 1989-02-16
ES2026614T3 (es) 1992-05-01
DK596088A (da) 1989-04-29
EP0313758A1 (fr) 1989-05-03
DK596088D0 (da) 1988-10-27
DK165020C (da) 1993-02-08
ATE68579T1 (de) 1991-11-15
CA1305310C (fr) 1992-07-21
DK165020B (da) 1992-09-28

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